Depending on the type of mold which we designed section for the appropriate channel. Although the channel has circular cross section is the best but higher processing costs should in fact people tend to use the channel with trapezoidal cross section or trapezium correction for lower processing costs.
Type channel with trapezoidal cross section used within 3 panels because in this type of mold parting surface will easily be deflected if we use the channel with round cross section.
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